Technics RS-B465 User manual

ORDER NO. AD9005125C2
Service
Manual
Dolby NR-Equipped
Stereo Cassette Deck
OC wots B-C NR HX PRO]
* HX Pro headroom extension originated by Bang
Olufsen and manufactured under license from Dolby
Laboratories Licensing Corporation.
“DOLBY”, the double-D symbol, and ‘‘HX PRO” are
trademarks of Dolby Laboratories Licensing
Corporation.
RS-B755 MECHANISM SERIES (AR350)
@ SPECIFICATIONS
lM CASSETTE DECK SECTION
Deck system
Track system
Stereo cassette deck
4-track, 2-channe|
Heads
Rec/Play
Erasure
Motors
Capstan drive DC servo motor
Reel table drive DC motor
Recording sysiem AC bias
Bias frequency 80. kHz
Erasing system AC erase
Tape speed 4.8. cm/sec. (17/s ips)
Frequency response
NORMAL 30 Hz~15 kHz (+3 dB)
30 Hz~15 kHz (DIN)
CrO2 30 Hz~16 kHz (+3 dB)
30 Hz~16 kHz (DIN)
METAL 30 Hz~17 kHz (+3 dB)
30 Hz~17 kHz (DIN)
x recording level, CrOz type tape)
74 dB (CCIR)
66 dB (CCIR)
56 dB (A weighted)
S/N (signal jevel=
Dolby C NR on
Dolby B NR on
Dolby NR off
Technics
Cassette Deck
RS-B465
Color
| (K)...Black Type |
Wow and flutter
Fast forward and rewind times
Approx. 90 s
Input sensitivity and impedan
MIC 0.25 mV/6000~10 kQ
LINE IN 60 mV/47 kO
Output voltage and impedance
LINE OUT
HEADPHONES
@ GENERAL
Power consumption 16 W
Power supply
For Continental Europe, F.R. Germany and italy
AG 50/60 Hz, 220 V
AG 50/60 Hz, 240 V
For Great Britain
Dimensions (WXHxXD) 430 x 125x290mm
(1615/16 415/16” 1119/32
Weight 4.3 kg (9.5 1b.)
Note:
Specifications are subject to change without notice.
Weight and dimensions are approximate
Matsushita Electric Industrial Co., Ltd.
Central P.O. Box 288, Osaka 530-91, Japan

RS-B465
Mi CONTENTS
Page
ACCESSORIES .......:cscsssssssssscsstensestsensssscsseasecesvarseeceesnnseseenserss 2
CONNECTIONS .......cececscsssesssestssssssonsnsesesnsseeessstecseneseseserssecs 2
FRONT PANEL CONTROLS AND FUNCTIONG.............. 3,4
DISASSEMBLY INSTRUCTIONG...........ccscccssscseessseseersees 5~8
MEASUREMENT AND ADJUSTMENT METHODES.... 8~10
TERMINAL FUNCTION OF IC...........csccssersceressceosesecesseerss 11
INTERNAL CONNECTION OF EL .........::csssssessssssssscerseseeees 12
BLOCK DIAGRAM ............ccsssssccossesssseseosseessesecreerseeseneees 13,14
TERMINAL GUIDE OF IC’S, TRANSISTORS AND
DIODES bocce nvetsendecctacsiestesccaideassbeasiccpocasbetsacessostcavesdecees 15
li ACCESSORIES
© AC power supply cord... ..........0 000 cee eee 1
(SFDACOS5E03)... (E, =
(SJA193-1)......... (EB)
Mi CONNECTIONS
Make connections in the numbered sequence by using the in-
cluded cables.
@) Connect the stereo connection cables.
@ Connect the AC power supply cord.
Receiver or amplifier (not included)
REC PLAY
OUT BACK
Household
AC outlet
¢ Stereo connection cables.....................0005 2
(SJP2249-3)
AC power supply cord (@)
The configuration of the AC outlet and AC power supply cord dif-
fers according to area.
For United Kingdoom
Household AC outlet
rs
X 7
Fit a suitable plug to the AC power
supply cord.
pply
| Placement hints
If this unit is placed near a receiver or a tuner, a “hum” noise
may be heard during tape playback, recording, or AM
reception of the receiver or the tuner.
If this occurs, leave as much space as possible between the
units, or place them where there is the least amount of
“hum”.
Note:
This unit is a precision instrument. Be sure to place it on a flat sur-
face.

RS-B465
Mi FRONT PANEL CONTROLS AND FUNCTIONS
Control section
@ Power “standby © /on” switch
(power/H standby (5 = on)
This switch switches ON and OFF the secondary circuit power
only. The unit is in the “standby” condition when this switch
is set to the standby (!) position. Regardless of the switch
setting, the primary circuit is always “live” as long as the
power cord is connected to an electrical outlet.
(2) Eject button (4 eject)
This button can be used to open the cassette holder.
(3) Cassette holder
4) Display section
timer counter memory r peak hold reset “
rec off -— play auto manual }
cue and review
5] Recording-level control (rec level)
This control can be used to regulate the recording level.
@ Recording-balance control (balance)
This control can be used to balance the left and right sound
levels during recording.
@ Microphone jacks (mic)
© Bias-adjustment control (bias adjust)
The frequency response for each tape type can be equalised
by using this control.
9) Operation section
© Headphones jack (phones)
MPxX filter; aes noise reduction —— 1
1 B—DolbyNR—C

RS-B465
Operation section
® Timer switch (J timer)
This switch is used to automatically begin a tape recording or
tape playback at a certain time, selected by a timer (not in-
cluded).
@ Counter reset button (counter reset)
This button can be used to reset the tape counter indication
to “000”.
® Memory-stop button (memory stop)
This button can be used to rewind the tape to the preset “000”
point when the rewind (<4) button is pressed.
@) Peak hold reset button
(peak hold reset auto/manual)
auto: The peak level of the source is held and displayed
for approximately one second at a time.
manual: The peak level of the source is held and displayed
continuously.
To reset the peak hold function, press this button
once again.
® Multiplex filter switch (MPX filter)
This prevents the Dolby circuit from operating in error when
FM stereo broadcasts are recorded using the noise reduction
function.
® Dolby noise-reduction buttons
(noise reduction)
These buttons can be used to reduce the hiss noise that is
characteristic of tape. This unit is provided with both the Dolby
B NR-type and C NR-type noise-reduction systems.
@® Record button (rec/®@)
This button can be used to change the tape deck to the
recording stand-by mode.
@® Automatic-record-muting button
(auto rec mute/Q)
This button can be used to make a silent interval on the tape
being recorded on tape deck.
@® Pause button (pause/#1)
This button can be used to temporarily stop the tape playback
or recording of tape deck.
@ Fast-forward/cue, rewind/review buttons
(cue/review/> >./<<)
These buttons can be used to advence or rewind the tape.
During playback these buttons are used to cue or review while
listening to the contents at high speed.
@ Playback button (play/P)
This button can be used to start the playback or recording of
the cassette.
(The tape will then begin moving in the left-to-right direction.)
@ Stop button (stop/H)
This button can be used to stop tape movement.
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-20 -15 —10 —6 -3 0 +1 og +5 +8
CURES GRGEE REGEE CORTE RUNEE CRUUE GERRS BRAG BOSON SUES
=
+
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’
a
Display section
@) Recording indicator ([%)
This indicator illuminates to indicate that this tape deck is in
the recording stand-by mode, or is recording.
@) Playback indicator (play)
When this indicator illuminates steadily, it indicates that this
tape deck is in the playback mode or the recording mode.
When it flashes continually, this is an indication that this tape
deck is in the pause mode or the recording stand-by mode.
® Input level meter
During playback, this meter indicates the level of the recorded
sound.
During recording, it indicates the level being recorded, ad-
justed by the recording-level control.
@ Dolby noise-reduction indicators ({B], [C])
Each indicator illuminates to show the type of Dolby noise-
reduction system selected by pressing one of the Dolby noise-
reduction buttions.
@ Multipiex filter indicator (MPX)
Iiluminates to indicate that the multiplex filter is set to “on”.
@ Memory-stop indicator (M.stop)
This indicator illuminates to indicate that this tape deck is in
the memory stop mode.
€@ Tape-select indicators
The type of tape being used will be automatically detected and
the indicator will iltuminate.
€) Tape counter
Indicates the amount of tape movement.

RS-B465
=~)
Mi DISASSEMBLY INSTRUCTIONS
“ATTENTION SERVICER”
Some chassis components may have sharp edges. Be careful when disassembling and servicing.
Removal of the cabinet ee Removal of the main P.C.B.
3) Procedure | 1 Remove the 7 screws (@~@).
ee 1>2 2. Remove the rear panel from the projec-
tion of the bottom chassis.
Cabinet
Rear Panel
Ce Projection
w
0 Ce Bottom Chassis
0 Projection
Remove the 6 screws (9~@).
3. Remove the 6 screws (O~®).
4. Remove the 1 connector (CP1).
5. Remove the 4 flat cables (CN2, CN3, CN4, CN7).
6. Remove the main P.C.B. in the direction of the arrow.
How to remove the flat cable
¢ Pull out the flat cable while 1. Lift the connector.
pressing the connector. 2. Pull out the flat cable.
My. Flat Cable
a Connector
Flat
/ Cable ag
Connector
’
Main PC.B. »
@O
| How to check the main P.C.B.
When checking the soldered surfaces of main P.C.B. 4. Remove the bottom board in the direction of the ar-
and replacing the parts, do as show. row ©.
1. Remove the 9 screws (@, ©, @~®) in above figure. 5. Reinstall the front panel to the main P.C.B.
2. Remove the 5 screws (O~®).
3. Remove the front panel in the direction of the arrow

RS-B465
Procedure
2. Remove the 1 connector (CP1).
3. Remove the 3 flat cables (CN3, CN4, CN7).
y Front Panel
4. Remove the front panel in the direction of the
arrow.
| Procedure
1-3-4
Knobs
1. Pull out the 3 knobs.
2. Remove the 1 nut.
. Remove the 6 screws (@~@).
. Release the 2 claws.
Remove the FL drive P.C.B. in the direction of the
arrow.
OR w
Removal of the rec level P.C.B. and
mic jack P.C.B.
Ref. No.
6 Removal of the operation P.C.B.
Procedure
1-345
Mic Jack PC.B.
i Removal of the rec level P.C.B.
* Remove the rec level P.C.B. in the direction of the
arrow.
i Removal of the mic jack P.C.B.
¢ Remove the mic jack P.C.B. in the direction of the
arrow.
Procedure
1--3-—--4—6
1. Remove the 4 screws (@~®).
2. Release the 4 claws.

RS-B465
Removal of the mechanism unit
Mechanism Unit
Procedure
1-3-7
Eject Button
1.
Push
the
eject
button.
2.
Remove
the
4
screws
(O~®).
Ref. No.
Removal of the damper gear Removal of the cassette holder
Procedure
I 8
Procedure 1-3 7-8
1-3—-7-8
e Remove the 1 screw (@).
Removal of the power switch/
headphones P.C.B.
1. Remove the rib in the direction of the arrow.
2. Remove the cassette holder spring.
Procedure
1>3—-10
Power Switch
/Headphones PC.B.
Power Switch
Button
Holder
Cassette Holder
1. Remove the power switch button by pushing it from
behind the front panel.
Remove the 2 screws (@, @).
Release the 1 claw.
Remove the holder.
3. Pull out the cassette holder in the direction of the
arrow.
PON

RS-B465
11
Procedure
1—3-10
11
Removal of the eject lever and
eject button
Eject Lever :
Eject Lever
1. Push the claw in the direction of the arrow ®. 3. Puil out the eject button.
2. Remove the eject lever in the direction of the arrow
©.
Removal of the power supply P.C.B.
Procedure
1-12
1. Remove the 1 flat cable (CN2).
2. Remove the 4 screws (@~®).
li’ MEASUREMENT AND ADJUSTMENT METHODES
Measurement Condition
@ Rec. level control; Maximum @ Balance control; Center
@ Timer stand-by switch; Off @ Make sure heads are clean
@
Noise
reduction
select
switch;
Off
@
Make
sure
capstan
and
pressure
roller
are
clean
@ MPX filter switch; Off @ Judgeable room temperature 20+5°C(68219°F)
Measuring instrument
@ EVM(Electronic Voltmeter) @ ATT(Attenuator)
@ Oscilloscope @ DC volimeter
@ Digital frequency counter @ Resistor (6000)
@ AF oscillator
Test tape
@
Head
azimuth
adjustment
(8kHz,
-20dB);
QZZCFM
@
Playback
gain
adjustment
(315Hz,
0dB);
QZZCFM
@
Tape
speed
adjustment
(3kHz,
-10dB);
QZZCWAT
@
Overall
frequency
response,
Overall
gain
adjustment
@
Playback
frequency
response
(315Hz,
12.5kHz,
10kHz,
Normal
reference
blank
tape;QZZCRA
8kHz, 4kHz, 1kHz, 250Hz, 125Hz, 63Hz, -20dB); CrQz reference blank tape; QZZCRX
QZZCFM Metal reference blank tape; QZZCRZ

HEAD AZIMUTH ADJUSTMENT
.Playback the azimuth adjusment portion (8 kHz, -20 dB)
of the test tape (QZZCFM). Vary the azimuth adjusting
screw until the outputs of the L-CH and R-CH are maxi-
mized and the lissajous waveform, as illustrated, ap-
proaches 0 degrees.
Note: If L-CH and R-CH are not maximized at the same
point, adjust to the point where the levels of each
channel are maximized and equal.
2.Perform the same adjustment in the play mode.
3. After the adjustment, apply screwlock to the azimuth
adjusting screw.
TAPE SPEED ADJUSTMENT
1.Playback the middle portion of the test tape (QZZCWAT).
2. Adjust the VR901 so that the output is within the standard
value.
Stardard value: 3000 + 15Hz
PLAYBACK GAIN ADJUSTMENT
1.Playback the gain adjusted portion (315 Hz, 0 dB) of the
test tape (QZZCFM).
2. Adjust VR1 (L-CH) and VR2 (R-CH) so that the output is within
the standard value.
Standard value: 0.4V+0.5dB
PLAYBACK FREQUENCY RESPONSE
1.Playback the frequency response portion (315 Hz, 12.5
kHz ~ 63 Hz, -20 dB) of the test tape (QZZCFM).
2.Assure that the frequency response is within the range
shown in Fig. 6 for both L-CH and R-CH.
LINE OUT
OVERALL GAIN ADJUSTMENT
1.Insert the Normal blank test tape (QZZCRA) and set the
unit to the Record pause mode.
2.Apply a reference input signal (1 kHz, -24 dB). Attenuate
the output so that its level becomes OV.
3.Record this input signal.
4.Playback the signal recorded in step 3 above , and
assure that the output is within the standard value.
5. Hf it is not within the standard value, adjust VR3 (L-CH) and VR4
(R-CH).
6.Repeat the step 2 ~ 5 above until the output is within the
standard value.
Standard value: 0.4V + 0.5dB
RS-B465
Record/ Playback Head
Azimuth Screw
Fig.2
LINE OUT
Digital frequency
counter
LINE OUT
63Hz 100Hz 200Hz |SO0OHZ 1kHz 2kHz 4kHz
Fig.6
LINE IN LINE OUT
AF oscillator ATT EVM Oscilloscope

RS-B465
OVERALL FREQUENCY RESPONSE
1.Insert the a Normal blank test tape (QZZCRA) and set
the unit to the Record Pause mode.
2.Apply a reference input signal (1 kHz, -24 dB) through
an attenuator.
3.Attenuate the signal by 20 dB and adjust the frequency
from 50 Hz ~ 10.0kHz.
4.Record the frequency sweep.
5.Playback the recorded signal and assure that it is within
the range shown in Fig.8 in comparison to the reference
frequency (1 kHz).
6.If it is not within the standard range, adjust VR301 (L-CH)
and VR302 (R-CH) so that the frequency level is within
the standard range.
7.Repeat steps 2 ~ 6 above using the CrOz tape(QZZCRX)
and the Metal tape(QZZCRZ) increasing the frequency
range to 12.5kHz (60Hz2~12.5kHz).
8.Assure that the level is within the range shown in Fig.9.
LINE IN LINE OUT
AF oscillator ATT EVM Oscilloscope
¢ Adjustment points
MAIN PC.B.
TAPE SPEED ADJ.
VR9OI (XI)
VR302 VR30l
Normal Overall frequency response chart (NR OUT)
5OHz 100Hz 200Hz SOOHZ 1kHz 2kHz
Fig.8
CrO,-Metal Overall frequency response chart (NR OUT)
5OKz 100Hz 200Hz SO0H2 1kHz 2kHz 12.5kHz2
Fig.9
Line Line
Out in
LJ]
= PLAYBACK GAIN ADJ.
VRi (Leh, VR2(Rch)
= OVERALL GAIN ADJ.
VR3(Lch), VR4(Rch)
OVERALL FREQUENCY RESPONSE ADJ.
VR3Ol(Lch), VR302(Rch)